Recycled water quality

Recycled water from the East Bayshore and San Ramon Valley treatment plants is safe for human contact. The water quality meets California Department of Public Health Title 22 criteria for unrestricted reuse. 

Regular laboratory testing ensures our community's health and safety, and helps customers use recycled water effectively for irrigation and other non-drinking purposes.

The numbers below are stated as averages (means) of all annual samples, unless stated as a range or otherwise annotated.

Abbreviations are defined below.

Recycled Water Quality Data
2020 Annual Averages

Oakland & Emeryville
San Ramon & Danville
Ammonia mg/L 47.3 31.1
Bicarbonate mg/L 361.7 319
Boron mg/L 0.23 0.69
Calcium mg/L 22 54
Chloride mg/L 313 195

Chloramine Residual
(as Chlorine)

mg/L 1.26 --[3]
Total Coliform MPN/100 mL <2[1] <2[1]


mmhos/cm 1.8 1.49
Copper mg/L 0.009 0.01
Fluoride mg/L 2.88 --[3]
Iron mg/L 0.12 --[3]
Lead mg/L 0.002 <.0005
Magnesium mg/L 16 30
Nitrate (as Nitrogen) mg/L 0.9 0.17
(as Phosphorus)
mg/L 4.07 --[3]
pH 0 -14 scale 7.11 7.34
Silica mg/L 5.7 - 6.8 17.8 - 21.7
Sodium Adsorption
Ratio (SAR)[2]
calculated 50.29 25.46
Sodium mg/L 219.2 162
Sulfate mg/L 48.8 129
Total Dissolved Solids (TDS) mg/L 822 759
Zinc mg/L 0.05 0.01



Note 1
Median measurement. The median reading for coliform readings at EBRWP and SRVRWP was beneath 2 MPN/100 mL in 2019 and coliform readings were in compliance with state regulations at both treatment plants.
Note 2
Sodium Adsorption Ratio (SAR) is a measure of the amount of sodium (Na) relative to Calcium (Ca) and magnesium (Mg) in water, and is used as a quality metric for irrigation.
Note 3
Data not available from the San Ramon Valley Recycled Water Program laboratory.


EBRWP: East Bayshore Recycled Water Project, an EBMUD project serving Oakland, Emeryville, Berkeley, Albany and Alameda.
SRVRWP: San Ramon Valley Recycled Water Program, a joint project of the Dublin San Ramon Services District & EBMUD. EBMUD's portion of the project is designed to serve customers in San Ramon, Danville and Blackhawk.
mg/L: Milligrams per liter, or parts per million
mmhos/cm: Millimhos per centimeter (equivalent to decisiemens per meter [dS/m], the international unit for electrical conductivity)
MPN: Most Probably Number (of viable bacterial cells in a 100 mL sample).
mL: Milliliter, or 0.001 liter; 100 ml = 0.1 liter (1/10)